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Method for improving anti-penetrability of recycled concrete

A technology of recycled concrete and impermeability, which is applied in the field of building construction materials, can solve the problems of lack of improving the impermeability and durability of recycled concrete, and achieve the effect of strong practicability, improvement of impermeability and durability, and easy realization.

Inactive Publication Date: 2016-01-20
SHANGHAI URBAN CONSTR MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for improving the impermeability of recycled concrete, which is used to solve the problem of lack of improved impermeability and durability of recycled concrete in the prior art

Method used

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  • Method for improving anti-penetrability of recycled concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Prepare C30 recycled concrete with a slump of (180±20) mm. In order to study the effect of the replacement rate of recycled coarse aggregate and the amount of air-entraining agent on the impermeability of recycled concrete, it was designed according to the equal water-cement ratio.

[0073] First weigh the cementitious material, and select the total weight of the cementitious material from the "Ordinary Concrete Mix Proportion Design Regulations" JGJ55-2011 to be 400kg / m 3 , the water-binder ratio is 0.44. In terms of weight percentage, 20% of fly ash, 35% of slag powder and 45% of cement are respectively taken. Add the cementitious material to the concrete mixer and mix well. Then weigh the natural yellow sand, and determine the sand rate of ordinary concrete from the "Ordinary Concrete Mix Proportion Design Regulations" JGJ55-2011 to be 42%, and add 3% to determine the sand rate to be 45%. Then add the natural yellow sand into the concrete mixer, mix it with the ce...

Embodiment 2

[0077] The effect of air-entraining agent content on the impermeability of recycled concrete was studied. The recycled concrete was prepared according to the method steps in Example 1, the selected tea saponin content was 0%, 0.02% and 0.04% respectively, and the selected tea saponin content was 100%.

[0078] The mixing ratio is shown in Table 1, and the tea saponin dosage is the ratio of the tea saponin powder to the mass of the gelling material. (where RC is recycled concrete, the second digit in the number is the amount of tea saponin, and the last digit is the replacement rate of recycled coarse aggregate).

[0079] concrete number water additional water cement yellow sand natural aggregate recycled aggregate fly ash mineral powder Superplasticizer Air-entraining agent content (%) RC-0-100 176 14.6 180 797 0 974 80 140 6.4 0 RC-0.02-100 176 14.6 180 797 0 974 80 140 6.4 0.02 RC-0.04-100 176 14.6 180 797 ...

Embodiment 3

[0081] The recycled concrete prepared with the mix ratio shown in Table 2 in Example 2 above was used to measure the initial air content and measure its impermeability according to the "Ordinary Concrete Long-Term Performance and Durability Test" GB50082-2009 by the penetration height method.

[0082] The specific process of the impermeability test according to the penetration height method is as follows: use a round table specimen with a top diameter of 175mm, a bottom diameter of 185mm, and a height of 150mm, with 6 specimens in each group, and the age of the specimens is 28d. The test equipment is HS-40 concrete penetrometer. Using one-time pressurization method, split the specimen after 24 hours of constant pressure (1.6MPa), and test the average seepage height: take the average seepage height of 10 points equally spaced for each test piece as the seepage height of the test piece, and then use 6 The average value of the penetration height of each specimen was taken as the ...

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Abstract

The invention provides a method for improving anti-penetrability of recycled concrete. The method comprises 1, partly replacing cement in cementing material by fly ash and slag powder, 2, limiting a recycled coarse aggregate replacement rate use range, 3, adding a proper amount of an entraining-type additive into a recycled concrete mixture, and 4, carrying out complete recycled concrete preparation. The method provides appropriate fly ash, ore powder and tea saponin mixing amounts, a recycled coarse aggregate replacement rate and difference of the recycled concrete from common concrete in preparation. The method is used for improving anti-penetrability and endurance performances of recycled concrete and promotes recycled concrete popularization and application.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to a method for improving the anti-seepage performance of recycled concrete. Background technique [0002] Regenerated aggregates are obtained by crushing, processing, grading and blending waste concrete in a certain proportion. The concrete prepared by using recycled aggregates to partially or completely replace natural aggregates is called recycled aggregate concrete, or recycled concrete for short. Recycled concrete meets the requirements of sustainable development of the construction industry and has huge social, economic and environmental benefits, and has attracted increasing attention. [0003] In recent years, scholars at home and abroad have done more and more research on recycled concrete. From a microscopic point of view, the structure of recycled concrete is much more complicated than that of ordinary concrete. Recycled concrete is composed of three phases and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/08C04B18/12C04B18/16C04B24/42C04B111/27
CPCY02W30/91
Inventor 徐亚玲黄晖皓肖建庄陈悦海黄岚
Owner SHANGHAI URBAN CONSTR MATERIAL CO LTD
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